December weather forecastMartinsburg, WV

December

Weather in December

December in Martinsburg heralds the onset of winter, with the city cloaked in a frosty embrace. It is noteworthy to mention snowfall increases to 0.83" (21mm), invigorating the city's festive spirit. The city’s landmarks and streets donned in holiday decorations stand out against the snowy backdrop. As daylight hours curtail, the city lights begin to play a larger part in Martinsburg’s cityscape. The wind speed heightens to 6.4mph (10.3km/h), carrying the winter chill through the city.

Temperature

December in Martinsburg shows a mild decline in the average high-temperature, falling from November's fresh 52°F (11.1°C) to a chilly 42.8°F (6°C). During December, the nighttime temperature in Martinsburg averages of 29.8°F (-1.2°C).

Humidity

May, October and December, with an average relative humidity of 78%, are the most humid months in Martinsburg.

Rainfall

In Martinsburg, West Virginia, during December, the rain falls for 6.9 days and regularly aggregates up to 0.87" (22mm) of precipitation. In Martinsburg, during the entire year, the rain falls for 117.3 days and collects up to 12.24" (311mm) of precipitation.

Snowfall

Months with snowfall in Martinsburg are January through April, November and December. In Martinsburg, in December, snow falls for 3.3 days, with typically accumulated 0.83" (21mm) of snow. In Martinsburg, West Virginia, during the entire year, snow falls for 17.1 days and aggregates up to 4.69" (119mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:13 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:58 pm EST.

Sunshine

In Martinsburg, the average sunshine in December is 5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The average daily UV index of 2 in December transforms into the following instructions:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.

Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In December, in Martinsburg, the average high-temperature is 42.8°F (6°C), and the average low-temperature is 29.8°F (-1.2°C). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is appraised at 93.2°F (34°C).

May, October and December, with an average relative humidity of 78%, are most humid months.

In Martinsburg, the average relative humidity in December is 78%.

In Martinsburg, in December, during 6.9 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

In Martinsburg, in December, during 3.3 snowfall days, 0.83" (21mm) of snow is typically accumulated.

December has the shortest days of the year, with an average of 9h and 24min of daylight.

In December, the average day length is 9h and 26min.

In December, on the first day of the month, sunrise is at 7:13 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:58 pm EST.

The average sunshine duration in December is 5h.

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

52°F

42.8°F

37.4°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

6.9mph

7mph

7.9mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

21.9

21.1

21.7

Average UV index

Average cloud cover

38%

48%

Average visibility

6mi

Average temperature in December
Martinsburg, WV

Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (37.4°F).

Average low temperature in December: 29.8°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).

Average pressure in December
Martinsburg, WV

Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed in December
Martinsburg, WV

Average wind speed in December: 6.4mph

The windiest month (with the highest average wind speed) is March (7.2mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).

Average humidity in December
Martinsburg, WV

Average humidity in December: 78%

The months with the highest relative humidity are May, October and December (78%).
The month with the lowest relative humidity is July (73%).

Average rainfall in December
Martinsburg, WV

Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is July (1.5").
The driest month (with the least rainfall) is January (0.67").

Average rainfall days in December
Martinsburg, WV

Average rainfall days in December: 6.9 days

The month with the highest number of rainy days is May (14 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in December
Martinsburg, WV

Average snowfall in December: 0.83"

The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Martinsburg, WV

Average snowfall days in December: 3.3 days

The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Martinsburg, WV

Average daylight in December: 9h and 24min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

Average sunshine in December: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in December
Martinsburg, WV

Average sunshine days in December: 21.1 days

The month with the most sunshine days is November (21.9 days).
The month with the least sunshine days is May (14.6 days).

Average UV index in December
Martinsburg, WV

Average UV index in December: 2

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Martinsburg, WV

Average cloud cover in December: 48

The months with the most cloud cover are January, March and December (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in December
Martinsburg, WV

Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, November and December (6mi).
The months with the lowest visibility are May, September and October (5mi).